Knife-guard.



No. 655,280. Patented Aug. 7, |900.

W. J. STEWART KNIFE GUARD.

(Application ledreb. `17, 1899.)

UNITED STATES PATENT EEICE.

VILLIAM J. STEWART, OF MINNEAPOLIS, MINNESOTA.

KNIFE-GUARD.

SFECIFICATION forming part of Letters Patent No. 5,280, dated August 7, 1900. Application tiled February 17, 1899. Serial No. 705,764. (No model.)

To @ZZ whom t may concern.-

Be it known that I, WILLIAM J. STEWART, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Knife-Guards for J ointers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention has for its object to provide an improved knife-guard for jointers and similar machines; and to this end it consists of the novel devices and combinations of devices hereinafter described, and defined in the claim.

The invention is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Figure l is a plan view of a jointer with my improved knife-guard applied in working position thereto. Fig. 2 is a side elevation of the jointer and knife-guard shown in Fig. l. Fig. 3 is a plan showing in detail the knifeguard removed from working position, and Fig. 4 is a longitudinal vertical section taken on the line x4 x4 of Fig. 3.

Of the parts of the jointer, l indicates the standard or base; 2, the face or bed plate; 3, the adjustable work-guide or straight-edge bracket, and 4 the tool-shaft, suitably mounted in the ordinary manner and provided with the ordinary cutter 5 and a pulley 6, by means of which it is driven.

The knife-guard comprises a spring-arm a, which is secured at one end, as shown at a', to the bed-plate 2 and is provided at its free end with a plate-like knife-guard d2, which under the action of the spring-arm a is nor Inally held immediately over the cutters 5. At its forwardiedge the guard-plate d2 is beveled or provided with a cam-surface, as shown at as, and, as shown, it is provided at its under surface with a transversely-extended concave or channel a4, which gives clearance for the cutters or knives.

A piece of work e' is indicated by dotted lines in Fig. 1. When such a piece of Work is placed against the guide 3 and forced over 5o d2 will beinstantaneously thrown over the knives by its spring-arm ct.

The device above described is very simple, is of but very small cost, and I have found the same in practice to be. very efficient for the purpose had in view. The cam-actuated guard-plate above described need not be very large, Vbut only large enough t-o cover the cutters or knives when in its normal position.

The dangers encountered in the use of machines of the character above described Without a guard for the knives or cutters are a matter ot' common knowledge, and the importance of a simple and efficient guard or safety device which will not interfere with the work, but will prevent the fingers from being brought into contact with the knives, will be readily appreciated.

What I claim, and desire to secure by Letters Patent ot' the United States, is as follows: The combination with a jointer or similar machine, of a knife-guard comprising the arm 'd of spring material, secured at one end to the bed or face plate of the machine,and provided at its free end with the rigidly-secured guard head or plate et?, normally overlying the cutters and, movable ilatwise over the face of the bed-plate, being supported thereby, and

having the inclined or cam surface ct, said parts operating substantially as andL for thepurposes set forth.

In testimony whereofV I aflixmy signaturein presence of two Witnesses. Y

VILLIAM J. STEWART,

Witnesses: y i M. M. MCGROEY,

El). MERCHANT; 

